more messing with time, applying default time on drag and drop

Management.Web/Shared/Semester/AssignmentInDay.razor

@@ -19,6 +19,16 @@
           .Select(a => a.id)
           .Contains(Assignment.id)
       ) ?? throw new Exception("in day callback, could not find module");
+
+    var defaultDueTimeDate = new DateTime(
+      year: dropDate.Year,
+      month: dropDate.Month,
+      day: dropDate.Day,
+      hour: planner.LocalCourse.DefaultDueTime.Hour,
+      minute: planner.LocalCourse.DefaultDueTime.Minute,
+      second: 0
+    );
+
     var moduleWithUpdatedAssignment = currentModule with 
     {
       Assignments = currentModule.Assignments.Select(a => 
@@ -26,7 +36,7 @@
         ? a
         : a with 
         {
-          due_at=dropDate
+          due_at=defaultDueTimeDate
         }
       )
     };